STIGQter: STIG Summary: Cisco IOS XR Router RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

The Cisco PE router must be configured to enforce a Quality-of-Service (QoS) policy to limit the effects of packet flooding denial-of-service (DoS) attacks.

DISA Rule

SV-216806r531087_rule

Vulnerability Number

V-216806

Group Title

SRG-NET-000193-RTR-000112

Rule Version

CISC-RT-000780

Severity

CAT II

CCI(s)

• CCI-001095 - The information system manages excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial of service attacks.

Weight

10

Fix Recommendation

Step 1: Configure a class map for the SCAVENGER class.

RP/0/0/CPU0:R2(config)#class-map match-all SCAVENGER
RP/0/0/CPU0:R2(config-cmap)#match dscp cs1
RP/0/0/CPU0:R2(config-cmap)#exit

Step 2: Add the SCAVENGER class to the policy map as shown in the example below.

RP/0/0/CPU0:R2(config)#policy-map QOS_POLICY
RP/0/0/CPU0:R2(config-pmap)#no class class-default
RP/0/0/CPU0:R2(config-pmap)#class SCAVENGER
RP/0/0/CPU0:R2(config-pmap-c)#bandwidth percent 5
RP/0/0/CPU0:R2(config-pmap-c)#class class-default
RP/0/0/CPU0:R2(config-pmap-c)#bandwidth percent 10
RP/0/0/CPU0:R2(config-pmap-c)#end

Check Contents

Step 1: Verify that a class map has been configured for the Scavenger class as shown in the example below.

class-map match-all SCAVENGER
match dscp cs1
end-class-map

Step 2: Verify that the policy map includes the SCAVENGER class with low priority as shown in the following example below.

policy-map QOS_POLICY
class C2_VOICE
bandwidth percent 10
!
class VOICE
bandwidth percent 15
!
class VIDEO
bandwidth percent 25
!
class CONTROL_PLANE
bandwidth percent 10
!
class PREFERRED_DATA
bandwidth percent 25
!
class SCAVENGER
bandwidth percent 5
!
class class-default
bandwidth percent 10
!
end-policy-map

Note: Traffic out of profile must be marked at the customer access layer or CE egress edge.

If the policy map does not include the SCAVENGER class with low priority, this is a finding.

Vulnerability Number

V-216806

Documentable

False

Rule Version

CISC-RT-000780

Severity Override Guidance

Step 1: Verify that a class map has been configured for the Scavenger class as shown in the example below.

class-map match-all SCAVENGER
match dscp cs1
end-class-map

Step 2: Verify that the policy map includes the SCAVENGER class with low priority as shown in the following example below.

policy-map QOS_POLICY
class C2_VOICE
bandwidth percent 10
!
class VOICE
bandwidth percent 15
!
class VIDEO
bandwidth percent 25
!
class CONTROL_PLANE
bandwidth percent 10
!
class PREFERRED_DATA
bandwidth percent 25
!
class SCAVENGER
bandwidth percent 5
!
class class-default
bandwidth percent 10
!
end-policy-map

Note: Traffic out of profile must be marked at the customer access layer or CE egress edge.

If the policy map does not include the SCAVENGER class with low priority, this is a finding.

Check Content Reference

M

Target Key

4029

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